WO2009040735A2 - Mise en correspondance d'une voie de signalisation descendante par rapport à un élément de ressources - Google Patents

Mise en correspondance d'une voie de signalisation descendante par rapport à un élément de ressources Download PDF

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Publication number
WO2009040735A2
WO2009040735A2 PCT/IB2008/053867 IB2008053867W WO2009040735A2 WO 2009040735 A2 WO2009040735 A2 WO 2009040735A2 IB 2008053867 W IB2008053867 W IB 2008053867W WO 2009040735 A2 WO2009040735 A2 WO 2009040735A2
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WO
WIPO (PCT)
Prior art keywords
primary
channels
region
linear buffer
channel
Prior art date
Application number
PCT/IB2008/053867
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English (en)
Other versions
WO2009040735A3 (fr
Inventor
Frank Frederiksen
Lars E. Lindh
Jaakko Eero Samuli Visuri
Jussi K. Ojala
Original Assignee
Nokia Corporation
Nokia, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Corporation, Nokia, Inc. filed Critical Nokia Corporation
Priority to US12/678,305 priority Critical patent/US20110280193A1/en
Publication of WO2009040735A2 publication Critical patent/WO2009040735A2/fr
Publication of WO2009040735A3 publication Critical patent/WO2009040735A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer program products and, more specifically, relate to techniques to provide downlink (DL) control channel signaling to a plurality of user equipments (UEs).
  • DL downlink
  • UEs user equipments
  • EUTRAN evolved UTRAN aGW access gateway eNB EUTRAN Node B (evolved Node B)
  • E-UTRAN also referred to as UTRAN-LTE or as E-UTRA
  • UTRAN-LTE also referred to as E-UTRA
  • the current working assumption is that the DL access technique will be
  • OFDMA OFDMA
  • UL access technique SC-FDMA
  • E-UTRA Evolved Universal Terrestrial Access Network
  • a base station (sometimes referred to as a Node-B and, in the LTE system as the eNode-B or eNB) communicates with the user terminals or UEs in a frame using point-to-multipoint transmissions.
  • a part of the DL transmission is reserved for a control channel which defines how the resources in the frame are to be used by the UEs.
  • the control channel is individually coded for each UE and contains a number of CCEs, which are composed of a certain number of REs, where a RE can be considered to be a subcarrier symbol in an OFDM system.
  • CCEs which are composed of a certain number of REs, where a RE can be considered to be a subcarrier symbol in an OFDM system.
  • a CCE consists of 36 REs, however this value is subject to change, and may eventually be defined as 42 or 48 REs.
  • acknowledgment channels in LTE known as PHICH
  • responses ACK/NACK
  • BCH which is received by every UE and which carries both static system information (such as the system bandwidth) and semi-static information, which is updated at a low rate (for example, the numbers of ACK/NACK channels).
  • the DL control signaling uses three channels, i.e., the
  • PCFICH the PHICH and the PDCCH.
  • the definitions of these channels are as follows.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • PCFICH Occurs in the first OFDM symbol in each subframe and indicates the number of OFDM symbols assigned to DL control signaling. PCFICH is protected with heavy coding and the indicated value is in the rangel -3 for the FDD mode.
  • PCFICH is always located in the first OFDM symbol in the subframe and consists of 16
  • PHICH Carries the ACK/NACK signals corresponding to previous uplink transmissions.
  • the PHICHs can be sent in one or three control symbols.
  • PDCCH These control channels contain the DL-grants and UL-grants for the UEs, as well as certain special formats including the dynamic part of the broadcast channel.
  • One PDCCH is aggregated from one or several CCEs
  • the amount of reference symbols transmitted depends on the antenna configuration at the eNB, and is assumed to be known at the UE.
  • the power of the individual control channels can be balanced in such a way that a channel intended for those UEs located at the cell edge (those farthest from the eNB) can use more power than the channels intended for those UEs closer to the eNB.
  • control channel-to-RE mapping is required to guarantee:
  • mapping of CCEs occurs in blocks of four adjacent REs, known as a miniCCE, in order to support space-frequency block coded (SFBC) multi-antenna systems.
  • SFBC space-frequency block coded
  • this mapping of the CCEs is complicated by the fact that the size of the control channel OFDM symbols are of unequal size due to the reference symbols.
  • the UE must be able to decode the control channel without assuming that it has a priori knowledge of any semi-static settings.
  • the 3GPP LTE has not adopted any solutions for the control channel -to-RE mapping and, unfortunately, a decision has been made in LTE that the number of PHICHs, and the number of symbols they are mapped to, are semi-statically set.
  • the inventors have realized that this has the potential to create a problem if the UE must read the dynamic broadcast channel in order to be able to access the control channel, and must also read the control channel in order to be able to access the dynamic broadcast channel.
  • a method comprising storing one or more first channels in a first primary region of a linear buffer, and storing one or more second channels in a second primary region of the linear buffer, where if the second primary region is not large enough to store all of the second channels, one or more excess second channels are stored in a secondary area of the linear buffer.
  • a computer readable medium encoded with a computer program executable by a processor to perform actions comprising storing one or more first channels in a first primary region of a linear buffer, and storing one or more second channels in a second primary region of the linear buffer, where if the second primary region is not large enough to store all of the second channels, one or more excess second channels are stored in a secondary area of the linear buffer.
  • an apparatus comprising a memory, a controller configured to store one or more first channels in a first primary region of a linear buffer in the memory, the controller further configured to store one or more second channels in a second primary region of the linear buffer, and the controller further configured to respond to a condition where the second primary region is not large enough to store all of the second channels, to store one or more excess second channel in a secondary area of the linear buffer in the memory.
  • an apparatus comprising means for storing one or more first channels in a first primary region of a linear buffer, and means for storing one or more second channels in a second primary region of the linear buffer, and means, responsive to a condition where the second primary region is not large enough to store all of the second channels, for storing one or more excess second channels in a secondary area of the linear buffer.
  • Figure 1 shows a simplified block diagram of various electronic devices that are suitable for use in practicing the exemplary embodiments of this invention
  • Figure 2 illustrates a Table 1 that shows a number of resource blocks, miniCCEs for short and long symbols and suggested step sizes;
  • Figure 3 illustrates the division of a control resource into different areas
  • Figure 4 depicts an example of a mapping to three control symbols with a
  • Figure 5 shows an example of control channel areas in a case where the
  • PHICH uses one OFDM control symbol and the control channel uses more than one symbol, where in this example the primary PHICH area is fragmented by the primary PDCCH area;
  • Figure 6 is a logic flow diagram in accordance with a method, and the operation of a computer program, in accordance with an exemplary embodiment of this invention.
  • the exemplary embodiments of this invention provide a novel approach to the control channel-to-RE mapping, which satisfies the frequency diversity requirements and power averaging requirements, while at the same time solving the problem referred to above, by the use of a mapping structure that does not require the UE to explicitly know the number of PHICHs.
  • a wireless network 1 is adapted for communication with a UE 10 via a Node B (base station) 12, also referred to here as an eNB 12.
  • the network 1 may include a network control element (NCE) 14, such as an aGW.
  • NCE network control element
  • the UE 10 includes a data processor (DP) 1 OA, a memory (MEM) 1 OB that stores a program (PROG) 1OC, and a suitable radio frequency (RF) transceiver 1OD for bidirectional wireless communications with the eNB 12, which also includes a DP 12 A, a MEM 12B that stores a PROG 12C, and a suitable RF transceiver 12D.
  • the eNB 12 is coupled via a data path 13 to the NCE 14 that also includes a DP 14A and a MEM 14B storing an associated PROG 14C.
  • At least one of the PROGs 1 OC and 12C is assumed to include program instructions that, when executed by the associated DP, enable the electronic device to operate in accordance with the exemplary embodiments of this invention, as will be discussed below in greater detail.
  • the exemplary embodiments of this invention may be implemented at least in part by computer software executable by the DP 1OA of the UE 10 and by the DP 12A of the eNB 12, or by hardware, or by a combination of software and hardware. It is noted that any of these devices may have multiple processors (e.g. RF, baseband, imaging, user interface) which operate in a slave relation to a master processor. The teachings may be implemented in any single one or combination of those multiple processors.
  • processors e.g. RF, baseband, imaging, user interface
  • the eNB 12 and the UE 10 may include a buffer that may form a part of the MEM 1 OB or MEM 12B.
  • the buffer may be a linear buffer LB 1 OE or LB 12E as illustrated in Figure 1 , the use of which is described below.
  • the various embodiments of the UE 10 can include, but are not limited to, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • the MEMs 1OB, 12B and 14B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the DPs 1 OA, 12 A and 14 A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • Figure 3 shows the grouping of the PCFICH, PHICH and PDCCH to different regions before the mapping.
  • the PCFICH always consists of 16 symbols which are mapped to the first control symbol and can be treated differently.
  • the PDCCH is mapped to all control symbols (1-3).
  • the PHICH is mapped to one or three constant symbols depending on semi-static settings.
  • the PDCCH and PHICH are placed into a linear buffer 20, where the first portion is primarily reserved for the PHICH and which is sized to accommodate the maximum number of PHICHs. Note that this value is known to the UE 10 implicitly from the system bandwidth.
  • the PHICHs are stored into a PHICH primary region 3 A, which as a result may be only partially filled.
  • the PDCCHs are stored into a PDCCH primary region 3B. If this region is not sufficient the remaining PDCCHs are stored in a secondary PDCCH area 3 C after the already stored PHICHs.
  • the UE 10 does not need to know the number of PHICHs in order to access the first part of the PDCCHs, which are found in their predetermined primary region 3B. It is assumed that when important semi-static configuration data is transmitted it is signaled in the first part of the primary PDCCH region 3B.
  • the mapping to miniCCEs is made by transforming the linear index from the buffer 20 into a 2-dimensional (symbol, miniCCE offset) address. This may be accomplished in a diagonal manner, where adjacent indices are mapped to different parts of the frequency band and to the next symbol (if there are more than one control symbol).
  • the move from one index to another is defined by a step size, which is a prime number and dependent on the bandwidth.
  • the mapping operation is complicated by the fact that PCFICHs are already placed in the first symbol, and by the fact that the effective size of the symbols is different due to the reference symbols.
  • Figures 3 and 4 show the concepts involved in the mapping, and the Table
  • FIG. 1 shown in Figure 2 illustrates the symbols sizes and suggested step sizes for different bandwidths. Because of the fact that the step size is a prime number, it can be ensured that each position in the control symbols is visited only once.
  • Figure 5 shows an example of mapping for a case where the PHICH uses one OFDM symbol and the control channel uses more than one.
  • Figure 5 illustrates the control channel regions in the case that the PHICH uses one OFDM control symbol and the PDCCHs use more than one symbol.
  • the effective PHICH area 5C, of the primary PHICH region 5A is fragmented by the primary PDCCH region 5B.
  • the linear buffer 20 begins with the PHICH region 3A (at index 1) and continues with the PDCCH region 3B.
  • the mapping begins from the PHICH region.
  • the UE 10 knows where the PDCCH region 3B begins, as both the index and symbol offset are known implicitly from the BW.
  • the UE 10 then begins to read from the PDCCH region 3B because in the primary PDCCH region 3B the UE 10 expects to find broadcast information.
  • the linear buffer 20 is marked in Figure 3 and Figure 5. Any identification of coverage as it relates to the linear buffer 20 is non-limiting and may be interpreted to include more or less coverage than is illustrated by these markings.
  • the function index->(sym, offset) is created with the pseudo-code described above. In the example provided the number 7 is added to the offset, the symbol count is incremented and a modulo operation is performed to maintain the symbol and offset values within prescribed limits.
  • FIG. 4 three OFDM symbols are shown (the control channel) with the symbol number on the horizontal axis (designated as syml, sym2 and sym3) and the miniCCE offset on the vertical axis.
  • the first symbol contains fewer miniCCEs and, as a result, may have a smaller maximal offset than symbols 2 and 3.
  • the horizontal axis symbol number
  • the vertical axis miniCCE offset
  • the index defines a position in the linear buffer 20, and the 2-dimensional address defines a symbol and its offset.
  • Figure 4 may be interpreted as (in this non- limiting example):
  • mapping technique satisfies the basic frequency diversity requirements and power averaging requirements mentioned above, and it also allows the UE 10 to read the PDCCH portion of the control channel without prior knowledge of any semi-static settings.
  • the exemplary embodiments of this invention can be readily implemented at both the eNB 12 to provide the mapping and at the UE 10 to decode the mapping, and furthermore are readily scalable to different bandwidths.
  • the algorithm embodied by the pseudo-code example given above is generic and is operable for all system bandwidths.
  • FIG. 6 illustrates a logic flow diagram in accordance with a method and the operation of a computer program
  • Block 6 A one or more PHICHs are stored into a PHICH primary region of a linear buffer
  • Block 6B a plurality of PDCCHs are stored into a PDCCH primary region of the linear buffer
  • Block 6C if the PDCCH primary region is not large enough to store all of the PDCCHs, one or more excess PDCCHs are stored into a secondary PDCCH area after the already stored PHICHs in the PHICH primary region.
  • Block 6D the method continues by mapping the buffer contents to miniCCEs by transforming a linear index from the buffer into a 2-dimensional (symbol, miniCCE offset)
  • the mapping is accomplished in a diagonal manner, where adjacent indices are mapped to different parts of the frequency band, where a move from one index to another is defined by a step size, where the step size is a prime number and dependent on the bandwidth.
  • the PCFICH is mapped to a first control symbol.
  • the various blocks shown in Figure 6 may be viewed as method steps, and/or as operations that result from operation of computer program code, and/or as a plurality of coupled logic circuit elements constructed to carry out the associated function(s).
  • the exemplary embodiments of this invention further provide for the UE
  • mapping scheme that satisfies existing and future requirements and provides technical effects including:
  • the primary PHICH region is further divided into two sub regions called the effective PHICH area and the secondary PDCCH area,
  • mapping to miniCCEs is done by transforming the linear index from the buffer to a 2-dimensional (symbol, miniCCE offset ) in a diagonal manner using a step size which is bandwidth dependent.
  • memory such as the MEMS 1OB, 12B, and 14B can be configured to include a linear buffer and/or other allocated memory space for storing data including, but not limited to, the control channel elements and the PCFICH, PHICH, and PDCCH. Further, said memory is accessible by a transmitter or a receiver or other components which may be coupled to the transmitter or receiver in order to input, output, compile, and/or retrieve stored data so as to perform, implement or execute a method, computer program, or apparatus in accordance with the exemplary embodiments of the invention.
  • the various names used for the input and output parameters are not intended to be limiting in any respect, as these parameters may be identified by any suitable names.
  • the various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • connection means any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are “connected” or “coupled” together.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as several non-limiting and non-exhaustive examples.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Memory System Of A Hierarchy Structure (AREA)

Abstract

Selon un mode de réalisation d'exemple de l'invention, une ou plusieurs premières voies et une ou plusieurs secondes voies sont stockées dans un tampon linéaire. En particulier, la ou les premières voies sont stockées dans une première zone primaire du tampon linéaire, et la ou les secondes voies sont stockées dans une seconde zone primaire du tampon linéaire, si la seconde zone primaire n'est pas suffisamment importante pour stocker toutes les secondes voies, une ou plusieurs secondes voies destinées au surplus sont stockées dans une seconde zone du tampon linéaire.
PCT/IB2008/053867 2007-09-25 2008-09-23 Mise en correspondance d'une voie de signalisation descendante par rapport à un élément de ressources WO2009040735A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/678,305 US20110280193A1 (en) 2007-09-25 2008-09-23 Downlink control channel-to-resource element mapping

Applications Claiming Priority (2)

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US99528907P 2007-09-25 2007-09-25
US60/995,289 2007-09-25

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WO2009040735A3 WO2009040735A3 (fr) 2009-05-22

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US8737322B2 (en) * 2008-01-03 2014-05-27 Koninklijke Philips N.V. Method of exchanging data between a base station and a mobile station
WO2009087742A1 (fr) * 2008-01-04 2009-07-16 Panasonic Corporation Dispositif de station de base pour communication radio, dispositif de station mobile pour communication radio et procédé d'allocation de canaux de commande
KR101589600B1 (ko) * 2008-08-05 2016-01-28 삼성전자주식회사 직교 주파수 분할 다중 접속 방식의 이동통신 시스템에서 하향링크 데이터 채널에 대한 상향링크 응답 채널 송수신 방법 및 장치
KR101506576B1 (ko) * 2009-05-06 2015-03-27 삼성전자주식회사 무선 통신 시스템에서 백홀 서브프레임 채널 송수신 방법 및 이를 위한 장치
WO2013129870A1 (fr) * 2012-03-01 2013-09-06 엘지전자 주식회사 Procédé permettant de définir une zone de recherche pour détecter un canal de commande en liaison descendante dans un système de communication sans fil et appareil associé
CN103391619B (zh) 2012-05-09 2016-12-14 上海贝尔股份有限公司 在通信网络中进行ePDCCH资源元素映射的方法和装置
JP6440709B2 (ja) * 2013-07-23 2018-12-19 ゼットティーイー ウィストロン テレコム エービー 補助セル識別情報を伝送するための方法および装置

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US20060179392A1 (en) * 2005-02-08 2006-08-10 Takaaki Ota Handshakeless retransmission protocol

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